Thanks for the advice Chris.
I am wondering though, why do you suggest using a 1/2 wavelength antenna in the plane instead of a 1/4? You say it as if its more important than on the ground. Or is the assumption that a 1/2 already being used on the ground. My current setup with the XTends is a 1/2 with a bend in the ground and a 1/4 in the air. This should give at least 5km right?
On Apr 30, 2012 4:46 PM, "Chris" <
address@hidden> wrote:
I get over 25km with 115200 (haven't tried further) and a 8dbi panel antenna without any problems.
At 9600 i have gone as much as 40km out and the signal was rock solid both ways so i bet it could
probably go further than that.
One thing to watch for is the airborne antenna, don't use the normal 900Mhz l/4 whip antenna,
use a dipole antenna (l/2) or a J pole.
If you use an antenna that can be rotated (swivel) keep the modem body and the antenna
in a straight line, it makes a big difference.
I use this antenna http://www.dpcav.com/xcart/900MHz-Antenna-Compact-Dipole.html
You may also try a V dipole but not made from pcb (pcb antennas have a lot of losses).
I haven't tried 9600bps and joystick control though only at 115200.
As i said i had up link problems at normal mode but when i switched to the polling mode
all problems went away, instant response to GCS and joystick commands with no visible latency.
Nice plane you got i am sure that it must have almost no drag as it looks really slick.
Chris
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